English verb conjugation
CAN PREVENT

Regular verb: prevent - prevented - prevented

Affirmation

Simple form	V-ing form
I can prevent you can prevent she can prevent we can prevent you can prevent they can prevent	I can be preventing you can be preventing she can be preventing we can be preventing you can be preventing they can be preventing
Perfect	V-ing perfect
I can have prevented you can have prevented she can have prevented we can have prevented you can have prevented they can have prevented	I can have been preventing you can have been preventing she can have been preventing we can have been preventing you can have been preventing they can have been preventing

Negation

Simple form	V-ing form
I cannot prevent you cannot prevent she cannot prevent we cannot prevent you cannot prevent they cannot prevent	I cannot be preventing you cannot be preventing she cannot be preventing we cannot be preventing you cannot be preventing they cannot be preventing
Perfect	V-ing perfect
I cannot have prevented you cannot have prevented she cannot have prevented we cannot have prevented you cannot have prevented they cannot have prevented	I cannot have been preventing you cannot have been preventing she cannot have been preventing we cannot have been preventing you cannot have been preventing they cannot have been preventing

Interrogative form

Simple form	V-ing form
can I prevent? can you prevent? can she prevent? can we prevent? can you prevent? can they prevent?	can I be preventing? can you be preventing? can she be preventing? can we be preventing? can you be preventing? can they be preventing?
Perfect	V-ing perfect
can I have prevented? can you have prevented? can she have prevented? can we have prevented? can you have prevented? can they have prevented?	can I have been preventing? can you have been preventing? can she have been preventing? can we have been preventing? can you have been preventing? can they have been preventing?

Interro-negative form

Simple form	V-ing form
can I not prevent? can you not prevent? can she not prevent? can we not prevent? can you not prevent? can they not prevent?	can I not be preventing? can you not be preventing? can she not be preventing? can we not be preventing? can you not be preventing? can they not be preventing?
Perfect	V-ing perfect
can I not have prevented? can you not have prevented? can she not have prevented? can we not have prevented? can you not have prevented? can they not have prevented?	can I not have been preventing? can you not have been preventing? can she not have been preventing? can we not have been preventing? can you not have been preventing? can they not have been preventing?